Ring Spotlight Battery Drain While Plugged In

I have several ring spotlights and for the most part the batteries stay topped at 100%, but one of them is either failing to charge the batteries or just can't keep up with power usage. I put 2 full batteries in it a month ago or so and they are down to 4% and 27%. Oddly the left always seems to drain faster... The outlet is not on a switch or anything, so it's not an issue of the A/C source. Is this a faulty camera, faulty batteries, or a firmware issue? The devices do not display what version of firmware they are running but they do show "up to date." The issue was first identified in late 2019 when it was wired to a solar panel and I switched over to a wall socket thinking it was a sunlight issue. NOTE: I performed another hard reset and while it was updating it displayed "Firmware 21.27" but as soon as it finished it reverted and says "Up to Date" again. So useless! We will see if it can charge...